Mine walling



Patented Nov. 5, 1935 UNITED STATES PATENT OFFICE N Drawing. ApplicationJuly '7, 1934, Serial No. 734,195. In Germany June 28, 1932 2 Claims.

This invention relates to a yielding lining or walling for mines. Up tonow timber insertions have been used for this purpose but these are 5comparatively expensive and have only a short life.

It is known that tar beton (tar concrete) used in constructing roads hasgreat yielding capacity.

The invention utilizes this property of tar beton for the walling ofmines.

The mine walling according to my invention is composed of preshapedbricks, or blocks, of tar beton.

These bricks may be made from tar beton by moulding a mixture of tar andother material adapted to make beton under pressure in the hot or coldstate. Such bricks possess various resistances against pressuredepending on the method of their manufacture. Particularly, the

yielding capacity of shaped pieces of tar beton is regulated by suitablechoice of the binder (tar), its hardness and the size of the stonyparticles combined thereby. Tar beton bricks of greater strength areused for the main part of the walling or lining, whilst bricks ofsmaller strength are used as insertions (fillers) in the gaps betweenthe bricks of greater strength, instead of the known timber insertions.In order to increase the strength of the bricks they may be armoured byiron.

Linings, composed of blocks or bricks, according to the invention, arepractically not attackable by moisture, particularly by earth andmountain water containing acids and salts. Such blocks, or bricks, ofuniform and homogeneous 5 structure are easily and cheaply made abovethe ground and mounted below the ground in the mine at low cost, becauseno re-enforcements are necessary like heavy and diflicultly fitted ironstructures. A lining composed according to the 10 invention hastherefore proven superior to known linings composed of concrete, ironand Wood as to stability against chemical attacks and corrosions. Thelining yields to pressure without ruptures and is not permeable bywater. 15

I claim:

1. A mine and shaft lining exposed to moisture and heavy pressure fromoutside, while facing the tunnel hole on the inside, said lining beingcomposed ofpreshaped, yielding and water-repelling 20 bricks, consistingof tar beton.

2. A mine and shaft lining exposed to moisture and heavy pressure fromoutside, while facing the tunnel hole on the inside, said lining beingcomposed of pre-shaped, yielding and water-repelling 25 bricks,consisting of tar beton of difierent strength, said bricks of lessstrength being arranged as insertions between said bricks of greaterstrength.

JOSEPH PARUSEL. 30

